focus hold
Stores the lens position profile generated by the autofocus system so that it
can be used upon startup of imaging to focus at the edge of the plate. When
focus is in hold the lens will repeatedly play back the stored profile every
rotation of the drum. The drum has to be spinning, the PLL locked and the focus
profile learned for this command to work. The focus mode should also be in one
of the plotting modes (fmode 0 or 4).
Thermal
focus hold